| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Oil-based Drilling Fluid Pressure-bearing Plugging Materials Suitable for Fuling Shale Gas Field Reservoir |
| WANG Jun1, LUO Taotao1, PU Keyong2, TAO Cao3
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1 College of Oil and Gas Engineering of Chongqing University of Science and Technology,Chongqing 401331, China
2 Chuanqing Drilling Engineering Co., Ltd. of Drilling and Production Engineering Technology Research Institute,Guanghan 618300, Sichuan, China
3 The Third Oil Production Plant of Changqing Oilfield Branch, Yinchuan 750001, China |
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Abstract In order to solve the technical problem of frequent lost circulation in the long horizontal section of the reservoir in the Fuling shale gas field, based on the analysis of the geological characteristics of the gas field and the status of lost circulation, the pressure plugging material suitable for oil based drilling fluid was studied to solve the technical challenge of frequent lost circulation in the long horizontal section of the Fuling shale gas field.The material had the advantages of high filtration, high solid phase, compressibility and deformability. Temperature resistance evaluation, particle size analysis evaluation, plugging experimental research and drilling fluid performance evaluation were conducted for plugging mate-rials. The experimental results showed that the sealing material had good temperature resistance, and the particle size was mainly distributed in the range of larger than 0.5 mm and less than 0.25 mm. The best compound plugging scheme is (1—2)%FRAC-ATTACK+(1—2)%STRARA VANGUARD+(1—2)%VANGUARD+(2—3)%STRARA-FLEX MEDIUM+(2—3)%STRARA-FLEX FINE.The compound plugging material had good compatibility with the oil-based drilling fluid system and was suitable for fractures of different widths. The plugging zone formed by the plugging material in the 1—2 mm fracture is dense and firm and can withstand the pressure of 7 MPa, and the cumulative amount of filtrate lost in the experiment is less than 20 mL. Field application showed that the composite leakage plugging agent material had good compatibility with oil-based drilling liquid phase, and was suitable for on-site construction of reservoir leakage prevention and leakage prevention in Fuling shale gas field.
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Published: 25 March 2022
Online: 2022-03-21
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| Fund:Chongqing Science and Technology Commission Technology Innovation and Application Development (Social and People's Livelihood General) Project(cstc2018jscx-msyb0142),Chongqing Municipal Education Commission Science and Technology Research Project(KJQN201901538),and General Project of Chongqing Natural Science Foundation(cstc2020jcyj-msxmX0573). |
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2022, Vol. 36 
